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Seite 200 - The radius of a circle is a right line drawn from the centre to the circumference.
Seite 62 - The colures are two great circles called the equinoctial and solstitial, which intersect each other at right angles in the poles of the earth, dividing the ecliptic into four equal parts representing the four seasons.
Seite 63 - A cone is a solid figure described by the revolution of a right-angled triangle about one of its sides containing the right angle, which side remains fixed — Fig.
Seite 92 - EOUINOCTIAL, ill astronomy, a great circle of the celestial globe, whose poles are the poles of the world. It is so called, because whenever the sun comes to this circle, the days and nights are equal all over the globe ; being the same with that which the sun seems to describe, at? the time of the two equinoxes of spring and autumn.
Seite 35 - Azimuth, of the celestial bodies, is an arc of the horizon intercepted between the meridian and a vertical circle passing through the body.
Seite 130 - Membrane, with an opening in the centre called the pupil, which separates the anterior from the posterior chamber of the eye ; it is of various colours in different persons, and hence the name.
Seite 220 - An instrument for measuring the weight of the atmosphere by the compression of a column of gas.
Seite 122 - Hyperbola, a section of a cone made by a plane, so that the axis of the section inclines to the opposite leg of the cone.